Handi Hornet twist rate is 1:12" according to the FAQ which I have confirmed, the 22mag is 1:16". There are several members here shooting 50gr cast bullets in theirs, but most shoot the 35gr and 40gr Vmax. Anything heavier would be better served in a .223 Rem, IMO. :wink:
If I wanted to shoot a heavier bullet, the 60gr Vmax, 63gr Sierra #1370 or 64gr Winchester PP would be my first choices, they all shoot well in 1:12" .223 Handi barrels, but I don't know if the Hornet could push them fast enough to stabilize, that would remain to be seen.
Tim